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We report the discovery of an infrared (IR)-bright dust-obscured galaxy (DOG)that shows a strong ionized-gas outflow but no significant molecular gasoutflow. Based on detail analysis of their optical spectra, we found somepeculiar IR-bright DOGs that show strong ionized-gas outflow([OIII]$\lambda$5007) from the central active galactic nucleus (AGN). For oneof these DOGs (WISE J102905.90+050132.4) at $z_{\rm spec} = 0.493$, weperformed follow-up observations using ALMA to investigate their CO moleculargas properties. As a result, we successfully detected $^{12}$CO($J$=2-1) and$^{12}$CO($J$=4-3) lines, and the continuum of this DOG. The intensity-weightedvelocity map of both lines shows a gradient, and the line profile of those COlines is well-fitted by a single narrow Gaussian, meaning that this DOG has nosign of strong molecular gas outflow. The IR luminosity of this object is$\log\,(L_{\rm IR}/L_{\odot})$ = 12.40 that is classified as ultraluminous IRgalaxy (ULIRG). We found that (i) the stellar mass and star-formation raterelation and (ii) the CO luminosity and far-IR luminosity relation areconsistent with those of typical ULIRGs at similar redshifts. These resultsindicate that the molecular gas properties of this DOG are normal despite thatits optical spectrum showing a powerful AGN outflow. We conclude that apowerful ionized-gas outflow caused by the AGN does not necessarily affect thecold interstellar medium in the host galaxy at least for this DOG.

No sign of strong molecular gas outflow in an infrared-bright dust-obscured galaxy with strong ionized-gas outflow